1.B 2.A .3.C 4.B 5.C 6.B 7.B 8.C 9.A 10.B 11.B 12.B 13.A 14.A 15.A 16.A 17.A 18.C 19.B 20.A二、三、四、21.C 22.D 23.D 24.B 25.A 26.C 27.B 28.A 29.C 30.D 31.C 32.B 33.A 34.C 35.B 36.A 37.A 38.B 39.B 40.B 41.B 42.D 43.A 44.C 45.B 46.A 47.C 48.A 49.A 50.D 51.A 52.C 53.B 54.B 55.C 56.B 57.D 58.A 59.C 60.B 61.A 62.D 63.A 64.C 65.B 66.C 67.D 68.C 69.B 70.D 71.A 72.B 73.B 74.C 75.A五、1. cotton 2. accident 3. except 4. modern 5. visitors 6. twentieth 7. bridge 8. cinema 9. science 10. teeth六、1. trouble 2. feel 3. been 4. since 5. often 6. because 7. keep 8. nothing 9. have / heed 10. soon七、1. am fond of 2. wide enough， to 3. no longer 4. both， and 5. most popular teachers 6. instead of八、English is one of the most important languages in the world. It Is not only widely used for business between different countries but also (used as) a working language at many international meetings. 2008 Olympic Games will be held in Beijing. Many/ A lot of Chinese are busy learning English. As a student， I'll do my b